feat(go): add Bazel configuration for Go Gin template

  - Set up rules_go v0.59.0 and gazelle v0.47.0
  - Configure Go SDK 1.25.5
  - Add go_deps extension for dependency management
  - Configure Bazel 8.5.1 with Go-optimized build flags

Author: kangeunchan

go/gin/BUILD.bazel

@@ -0,0 +1,13 @@
+load("@gazelle//:def.bzl", "gazelle")
+
+gazelle(name = "gazelle")
+
+gazelle(
+    name = "gazelle-update-repos",
+    args = [
+        "-from_file=go.mod",
+        "-to_macro=deps.bzl%go_dependencies",
+        "-prune",
+    ],
+    command = "update-repos",
+)